Abstract
<jats:p>The speeding up of digitalization within the health industry and rising dependency on EHRs pose an immediate need for stronger cybersecurity architectures and protocols powered by quantum computing. The long-term confidentiality of EHRs is threatened by the assumption in cryptographic algorithms such as RSA and ECC that large-scale quantum computers will never exist, since these algorithms will be broken when they do. We propose a satisfaction-based Quantum-Secured Blockchain Ecosystem (QSBE) combining QKD with a permissioned blockchain to protect the provenance and availability of medical data while eliminating unauthorized detection from third parties. Automated and auditable patient-centric consent is enforced via smart contracts, with quantum-resistant cryptography safeguarding data against harvest-now, decrypt-later attacks. The ecosystem enables cross-institutional interoperability, regulatory oversight, and removal of single-point-of-failure. Use cases—telehealth, EHR exchange, drug traceability, emergency access—demonstrate relevance.</jats:p>